Add PipelinesHelpers to manage API params
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What does this MR do and why?
JiHu Issue: https://jihulab.com/gitlab-cn/gitlab/-/issues/4320
Refactor some Pipeline API related codes to support JiHu extension: JiHu MR!2679.
Except for the changes in code structure, the current MR has NOT made any functional changes, and the changes involved are also covered by previous tests.
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Edited by Kamil Trzciński